Anyone went for the glucose test? And what to expect? Can I go for the 1 hr instead of 3 hrs?

You won’t be able to just go for 1hr instead of 3hrs. They will first take a blood & urine sample before they get you to drink the glucose water. And after taking the glucose drink, you have to check back in twice after an hour each to take another sample of the blood and urine test. So the 3hrs is compulsory and necessary.